refactor(main.py): 使用anyio兼容层（默认后端为asyncio) 提高兼容性和可拓展性

[LIghtJUNction]

fixes #XYZ

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Motivation / 动机

动机：https://anyio.readthedocs.io/en/stable/why.html

Modifications / 改动点

Verification Steps / 验证步骤

Screenshots or Test Results / 运行截图或测试结果

Compatibility & Breaking Changes / 兼容性与破坏性变更

• 这是一个破坏性变更 (Breaking Change)。/ This is a breaking change.
• [ x] 这不是一个破坏性变更。/ This is NOT a breaking change.

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Checklist / 检查清单

• 😊 如果 PR 中有新加入的功能，已经通过 Issue / 邮件等方式和作者讨论过。/ If there are new features added in the PR, I have discussed it with the authors through issues/emails, etc.
• [x ] 👀 我的更改经过了良好的测试，并已在上方提供了“验证步骤”和“运行截图”。/ My changes have been well-tested, and "Verification Steps" and "Screenshots" have been provided above.
• [ x] 🤓 我确保没有引入新依赖库，或者引入了新依赖库的同时将其添加到了 requirements.txt 和 pyproject.toml 文件相应位置。/ I have ensured that no new dependencies are introduced, OR if new dependencies are introduced, they have been added to the appropriate locations in requirements.txt and pyproject.toml.
• [x ] 😮 我的更改没有引入恶意代码。/ My changes do not introduce malicious code.

Sourcery 总结

改进：

• 在 main.py 中使用 anyio.run 替代 asyncio.run，以支持多个异步后端并提高兼容性和可扩展性

Original summary in English

Summary by Sourcery

Enhancements:

• Use anyio.run instead of asyncio.run in main.py to support multiple async backends and improve compatibility and extensibility

[sourcery-ai]

你好 - 我已经审查了你的更改，它们看起来很棒！

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Original comment in English

Hey there - I've reviewed your changes and they look great!

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[LIghtJUNction]

@copilot 代码格式化

[Copilot]

@LIghtJUNction I've opened a new pull request, #3274, to work on those changes. Once the pull request is ready, I'll request review from you.

[LIghtJUNction]

@copilot mypy工具进行检查，看看有没有错误，修复一下

[Copilot]

@LIghtJUNction I've opened a new pull request, #3284, to work on those changes. Once the pull request is ready, I'll request review from you.

[LIghtJUNction]

@copilot 请你使用mypy进行检查，进修复异步相关的错误

[Copilot]

@LIghtJUNction I've opened a new pull request, #3288, to work on those changes. Once the pull request is ready, I'll request review from you.